It’s real for at least some people. She was experiencing a lot of pain for a few months. Never occurred to us that it was celiac. Blood test was the first diagnosis and then confirmed with a scope that her intestines were already damaged pretty badly. I used to roll my eyes at the gluten free stuff too but no longer.
On the other hand I’m in property management and the companion animal issue is a joke that we have pretty just given into. Probably 60-70 of our tenants now have them.